We've released a series of z88dk demo's for the ZX Spectrum Next. These are designed to complement Stefan Bylund's great series of examples.

Chess Demo

Demonstrates relative sprites for the ZX Spectrum Next.
https://www.baker76.com/zxnext-chess/

Tilemap Demo

Tilemap demo for the ZX Spectrum Next.
https://www.baker76.com/zxnext-tilemap/

Layer2 Tilemap Demo

Example using Layer2 tilemap rendering for the ZX Spectrum Next.
https://www.baker76.com/zxnext-layer2-tilemap/

SFX Demo

Sound effects demo for the ZX Spectrum Next.
https://www.baker76.com/zxnext-sfx/

Dual VT Sound Demo

Example showing dual Vortex Tracker II player for the ZX Spectrum Next.
https://www.baker76.com/zxnext-dual-vt-sound/

DMA Sample Demo

Based on David Saphier (em00k's) Multi Sample Engine in z80 for the ZX Spectrum Next.
https://www.baker76.com/zxnext-dma-sample/